-6=-3m-21

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Solution for -6=-3m-21 equation: 



-6=-3m-21

We move all terms to the left:

-6-(-3m-21)=0

We get rid of parentheses

3m+21-6=0

We add all the numbers together, and all the variables

3m+15=0

We move all terms containing m to the left, all other terms to the right

3m=-15

m=-15/3

m=-5

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